Errata: 2005 Update 3rd Edition Student Workbook | Elementary Principles of Chemical Processes

Updated 12-4-14

First pages of selected problems. All of the problems were supposed to start on right-facing pages so that filled-in solutions could be torn out and turned in. Unfortunately, some do not, so if the preceding problems are assigned the first pages of these problems will also be torn out. This problem will be remedied in subsequent printings, but for now the following first pages can be downloaded and printed by students (or by their instructors, who can photocopy and distribute them):
2.32, 2.38, 5.10, 5.23, 5.38, 5.46, 5.62, 5.80, 6.18, 6.24, 6.32, 6.39, 6.54, 6.60

p. 2-9, Prob. 2.31: Rewrite the statement in parentheses as follows: "(or more generally, to determine the adjustable parameters in the given formulas from experimental data for the dependent and independent variables)"

p. 4-23, Prob. 4.32(a): In the flow chart legend, change S = sugar to S = solids

p. 4-27, Prob. 4.36(a): In the statement just below the flow chart, change "as in feed to evaporator" to "as in feed to filter"

p. 4-35, Prob. 4.50(c): In the chlorine balance (the last of the set of equations in the middle of the page), change 4n₅ to 2n₅

p. 4-38, Prob. 4.59: On Line 5 of the overall process degree-of-freedom analysis, change 1 DOF to 2 DOF

p. 4.40, Prob. 4.59:
-- In Box 4.59-11, change the units of n_E from mol C₂H₄ to mol C₂H₄/h
-- On Lines 2 and 3 below the "Strategy" heading, put a dot above the n in n₃, and on Line 2 change 13.5 mol C₂H₄O to 13.5 mol C₂H₄O/h
-- On Line 2 below the "Solution" heading, put a dot above the n in (n₃)_original, and change mol to mol/h in the denominators of the next two terms.

p. 4.42, Prob. 4.70: In the N₂ balance in Table (4.70-2), delete the "N₂" in (100 mol N₂)

p. 5-11, Prob. 5.38: In Eq. (5.38-2), change the "Initial" 528K to 298K and the "Final" 528K to 508K

p. 5-22, Prob. 5.46: On the flow chart, change the units of all molar flow rates from mol/min to kmol/min (12 occurrences)

p. 5-23, Prob. 5.46:
Line 3 below Box 5.46-2: Change "one the flow rate" to "once the flow rate"
Box 5.46-3. In Line 1, change the units of n₀ from kg C₅H₁₂/min to kmol C₅H₁₂/min. In Line 2, multiply the right-hand side of the equation by 1.15 (since air is supplied in 15% excess).

p. 5-24, Prob. 5.46:
-- In the RT/P calculation for air in Box 5.46-7, change 9 to 13.
-- In Line 2 of Box 5.46-8, change 72.05 to 72.15.

p. 5-34, Prob. 5.80: In Eq. (5.80-5), add conversion factors of (1 kmol/1000 mol) and (1000 L/m^3).

p. 6-11, Prob. 6.32(a): In Line 1, change "methanol entering the absorber" to "gas entering the absorber"

p. 6-22, Prob. 6.60(b): In the last line on the page (Eq. 6.60-8), change 0.040 to 0.060

p. 7-5, Prob. 7.21: In Eq. (7.21-2), change N-m (above 1 atm in the dimensional equation) to N/m²

p. 7-10, Prob. 7.28: In the "Strategy" section, Paragraph 2, Line 2, change (saturated, 2.0 bar) to (saturated, 3.0 bar)

pp. 7-13 and 7-14, Prob. 7.41: On the flow chart and thereafter, change x_o to y_o (4 occurrences on p. 7-13 and 4 occurrences on 7-14) and change x₁ to y₁ (4 occurrences on 7-13 and 3 occurrences on 7-14). The changes are to be consistent with the usual text nomenclature of labeling vapor-phase mole fractions as y and liquid-phase mole fractions as x: they do not affect the solution.

p. 7-18, Prob. 7.45, line above (7.45-5): Change 1 atm (~1 atm) to 1 atm (~1 bar)

p. 8-1, Eq. [8.3]: Change the subscripts on the summations from out - in to final - initial.

p. 8-20, Prob. 8.30: In the E-Z Solve program of Box (8.30-12), on the line with the calculation of Hb, close the parentheses in 0.02894(T-500)

p. 8-37, Prob. 8.86: In Eq. (8.86-4), change 64.86 to -64.87 in Line 1, change -519 to -64.87 in Line 3, and change the first term of Line 4 from -_____ to -64.87

p. 9-5, Prob. 9.16:
-- On Line 3 of the first paragraph, change 1.00x10² kg/h to 1.00x10² kg/min
-- On Line 1 of Part (a), change kg SO₃/s to kg SO₃/min
-- On the flow chart, the molar flow rates of N₂ in the feed air and product gas streams should be labeled 3.76n₁ (mol N₂/s) (with dots over the n's)

p. 9-6, Prob. 9.16:. In Eqs. (9.16-3) and (9.16-4), insert "s" in the denominator of the first factor in each dimensional equation.

p. 9-14, Prob. 9.21: In the energy balance equation [just above Part (b)], change -233.58 to -231.9 (2 occurrences), and change 1.45x10^-3 to 1.415x10^-3. Change the final solution from 1.27 kJ to 1.31 kJ.

p. 9-15, Prob. 9.33: On flow chart, change the feed stream pressure from 1 atm to 5 atm

Selected Answers (back of workbook)

Prob. 2.31:
Change Eq. (2.31-2) to (2.31-3)
In Eq. (2.31-5), change s = a to s = B and delete I = b
Delete Eqs. (2.31-14) and (2.31-17)

Prob. 6.32: In Eq. (6.32-3), change z_m2 = 0.98 to z_in = 1.02, and change z_m1 = 1.02 to z_out = 0.98.

Prob. 8.86:
In Eq. (8.86-2), change 45.9 to 46.0
In Eq. (8.86-3), change -0.1455 to -0.15
In Eq. (8.86-4), change -59.06 to -59.1